I have a 7wt TT bass taper line so I can only comment on it. I don't really like it. It is more of a shooting head and while it does cast a long ways when you need it to, the head section feels so heavy and causes a lot of tip bounce or I guess I should say excessive flex in the tip on the back cast. It throws off my timing when I think the line has straightened out and then the weight of the head pulls on the rod tip. It just doesn't roll out smoothly for me. I much prefer the Rio Clouser over it.
I bought a Sylk line to use on my boo rod last year and did not like it either. I could not get used to the smaller diameter and went back to the good ole 444 peach for the boo and my glass brook trout rod.